EBYTE E108-GN Series GPS-BEIDOU Multi-Mode Satellite Positioning and Navigation Module User Manual

E108-GN Series User Manual
GPS/BEIDOU MULTI-MODE SATELLITE POSITIONING AND
NAVIGATION MODULE
Chengdu Ebyte Electronic Technology Co.,Ltd

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Product overview

1.1 Product introduction
E108-GN series is a high-performance, high-integration, low-power, low-cost multi-mode satellite positioning and navigation module, for BDS/GPS/GLONASS, small size, low power consumption, can be used for car navigation, smart wear, In the application of GNSS positioning such as drones, it also provides software and hardware interfaces compatible with other module manufacturers, which greatly reduces the user’s development cycle.
The module adopts the integrated design of RF baseband, integrates DC/DC, LDO, RF front-end, low-power application processor, RAM, Flash storage, RTC and power management, etc. It supports crystal oscillator or external pin clock input, which can be input through a coin cell battery or farad capacitor powers the RTC and backup RAM to reduce the time to first fix. It also supports a variety of ways to connect with other peripherals, and supports UART and GPIO interfaces. If you need I2C and SPI interfaces, please contact customer service for customization.

1.2 Features

• Support BDS/GPS/GLONASS multi-system joint positioning and single-system independent positioning;
• D-GNSS differential positioning, A-GNSS assisted positioning, ephemeris prediction, DR integrated navigation application, the fastest data update rate 10Hz;
• 32-bit application processor, the highest frequency is 133MHz, supports dynamic frequency adjustment;
• Support PPS output;
• Built-in reset controller;
• UART, GPIO interface;
• RTC: Support 32.768KHz±20ppm crystal oscillator, 1.1VRTC clock output, support external signal wake-up;
• Output format: support NMEA0183V4.1 and previous versions, the maximum fixed update frequency can reach 10Hz;
• High sensitivity: capture cold start -149dBm, hot start -162dBm, tracking -166dBm;
• The software and hardware are compatible with those of other manufacturers, which greatly reduces the user’s development cycle;

1.3 Application

• Vehicle positioning and navigation equipment;
• Wearable devices, such as GPS trackers, etc.;
• UAV positioning, industrial computer, etc.;
• Industry equipment that needs GNSS positioning or navigation;
  Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.

Specification and parameters

2.1 Working parameter

consumption
Receive current (mA)|  | 20|  |
Sleep current (μA)|  | 120|  | Software shutdown

2.2 Hardware parameter

versions

|

Maximum fixed update frequency up to 10Hz

Supported positioning systems| BDS/GPS/GLONASS|

2.3 GPS performance parameter

Positioning time (Test Condition 1)

| Cold start| 27.5| s
Hot Start| <1| s
Recapture| <1| s
Positioning time (Test Condition 1)| A-GNSS| <10| s

Sensitivity (Test Condition 2)

| Cold start| -149| dBm
Hot Start| -162| dBm
Recapture| -164| dBm
 | Track| -166| dBm
---|---|---|---

Precision (Test Condition 3)

| Horizontal positioning accuracy| 2.5| m
High positioning accuracy| 3.5| m
Speed positioning accuracy| 0.1| m/s
Timing accuracy| 30| ns
Power consumption (Test Condition 4)| Capture current| 35| mA
Tracking current| 20| mA
Operating temperature| —| -35℃-85℃| —
Storage temperature| —| -55℃-100℃| —
Humidity| —| 5%-95%RH(No

condensation)

| —

Note: The above results are GPS/Beidou dual-mode working mode; the highest altitude can reach 18,000 meters, but the accuracy of the data will be deviated after more than 10,000 meters.
[Test condition 1]: The number of receiving satellites is greater than 6, the signal strength of all satellites is -130dBm, the average value is obtained for 10 tests, and the positioning error is within 10 meters.
[Test condition 2]: The noise figure of the external LNA is 0.8, the number of receiving satellites is greater than 6, and the received signal strength value under the condition of locking within five minutes or not losing the lock.
[Test condition 3]: Open and unobstructed environment, 24 hours of continuous power-on test, 50% CEP. [Test condition 4]: The number of receiving satellites is greater than 6, and the signal strength of all satellites is -130dBm.

Size and pins definition

3.1 E108-GN01 pins definition

will be output
4| EINT3| External Interrupt 3| Default: pull-down, 8mA drive current

5

|

FORCE_ ON

|

Sleep wake-up pin

| When the module enters low power consumption, pull this pin high to exit the low power consumption mode (the level voltage of this pin is 1.1V, if the level of the control pin is not 1.1V, it needs to divide the

voltage)

6| EINTO| External interrupt 0| Default: pull-down, 8mA drive current
7| NC| Remained pins|
8| RSTN| Reset pin| Pull high by default, pull low to reset.
9| VCC_RF| RF power output| Power supply for active antenna (this RF output power supply voltage is equal to VCC)
10| GND| Module ground|
11| RF IN| RF input|
12| GND| Module ground|
13| GND| Module ground|
14| NC| Remained pins|
15| NC| Remained pins|
16| RSTN| Reset pin| Pull high by default, pull low to reset
17| EINT1| External Interrupt 1| Default: pull-down, 8mA drive current
18| TX1| UART1 output| (Reserved, 2.8V level)
19| RX1| UART1 input| (Reserved, 2.8V level)
20| TXD| UART output| (AT port, 2.8V level)
21| RXD| UART input| (AT port, 2.8V level)
---|---|---|---
22| VBKP| RTC power input| The RTC power supply must be powered, the module
23| VCC| Module power| (2.8V-4.2V）
24| GND| Module ground|

3.2 E108-GN02 pins definition

command
5| FORCE_ ON| Sleep wake-up pin| When the module enters the ultra-low power consumption, pull this pin high to exit the ultra-low power consumption mode (this pin is powered
6| VBKP| RTC power input| The voltage is 1.1V, if the control pin level is not 1.1V, it needs to divide the voltage)
7| NC| Remained pins|
8| VCC| Module power| (2.8V-4.2V）
9| RSTN| Reset pin| Pull high by default, pull low to reset;
10| GND| Module ground|
11| RF IN| RF input|
12| GND| Module ground|
13| ANTON| External| External LNA or active antenna power control pin 2.8V level:
14| VCCRF| RF power output| Power supply for external active antenna (this VCC RF output voltage is equal to VCC)
15| NC| Remained pins|
16| NC| Remained pins|
17| NC| Remained pins|
18| NC| Remained pins|

3.3 E108-GN02D pins definition

enter low power mode (default is high)
2| 1PPS| 1PPS output| 1PPS output, the user can set the frequency, duration, etc. through commands
3| GND|  | Module power ground wire
4| TXD| output| UART output (2.8V level)
5| RXD| enter| UART input (2.8V level)

6

|

VCC

|  | Module power supply (3~5.5V)

(The module startup voltage needs to provide a stable voltage of 4.2V. If the startup voltage is lower than this value, it may cause no printout of the serial port. After startup, it can be reduced to normal 3.3V voltage operation.)

Recommended circuit diagram

4.1 E108-GN01

4.3 E108-GN02D

Hardware design

• For the schematic design of the module, you can directly refer to the E108-GN01-TB-SCH in the data package;

• It is recommended to use a DC regulated power supply to power the module, the power supply ripple should not exceed 50mV, and the module must be grounded reliably;

• Please pay attention to the correct connection of the positive and negative poles of the power supply, such as reverse connection may cause permanent damage to the module;

• Please check the power supply to ensure that it is between the recommended power supply voltages. If it exceeds the maximum value, the module will be permanently damaged;

• The serial port TXD and RXD are LVTTL level, if connected with PC, it needs to be converted by RS232 level. Users can use this serial port to receive positioning information data and software upgrades;

• This module is a temperature-sensitive device, and its performance will be degraded due to severe temperature changes. Try to keep away from high-temperature airflow and high-power heating devices during use;

• When designing the power supply circuit for the module, it is often recommended to reserve more than 30% of the margin, so that the whole machine can work stably for a long time;

• The module should be kept away from parts with large electromagnetic interference such as power supply, transformer, and high-frequency wiring as far as possible. High-frequency digital wiring, high-frequency analog wiring, and power wiring must be avoided under the module.

• Assuming that the module is soldered on the TopLayer, the TopLayer in the contact part of the module is covered with ground copper (all copper and well grounded), which must be close to the digital part of the module and routed on the BottomLayer;

• Assuming that the module is soldered or placed on the TopLayer, it is also wrong to arbitrarily route wires on the BottomLayer or other layers, which will affect the stray and receiving sensitivity of the module to varying degrees;

• Assuming that there are devices with large electromagnetic interference around the module, it will also greatly affect the performance
  of the module. It is recommended to stay away from the module according to the intensity of the interference. If the situation allows,
  appropriate isolation and shielding can be done;

• Assuming that there are traces with large electromagnetic interference around the module (high-frequency digital, high-frequency analog, power traces), it will also greatly affect the performance of the module. It is recommended to stay away from the module according to the intensity of the interference. Proper isolation and shielding;

• The antenna installation structure has a great influence on the performance of the module, make sure that the antenna is exposed and preferably vertically upward;

• When the module is installed inside the casing, a high-quality antenna extension cable can be used to extend the antenna to the outside of the casing;

• The antenna must not be installed inside the metal shell, which will greatly weaken the transmission distance.

E108-Product test

6.1 Serial port assistant
Test based on E108-GN01-TB, if there is no test board, you can refer to the backplane schematic diagram in the data package (this test content is also applicable to E108-GN02/D).

1. After connecting the GPS antenna, connect to the computer through the USB cable at the same time, there is a USB port on the opposite side of the antenna of the board, and then press the switch button to turn it on.
2. Note that when using an active antenna, the two pins of RF_POWER need to be short-circuited with jumpers.
3. You can open the serial port assistant to view the data reported by the serial port, or use our naviTrack to view it.

When the baud rate is set to 9600bps, data will be reported all the time after opening the serial port. The common output format is as follows: GGA: time, location, number of satellites;
GSA: GPS receiver operation mode, satellites used for positioning, DOP value, positioning status;
GSV: visible GPS satellite information, elevation angle, azimuth angle, signal-to-noise ratio; RMC: time, date, position, speed;
VTG: ground speed information (for details, please refer to the NMEA0183 protocol;);
6.2 Operating naviTrack
For the convenience of use, we recommend using the exclusive tool TaviTrack for debugging. For details, see the “naviTrack User Manual”.

1. Run naviTrack with administrator privileges and run the following page:

2. Select the corresponding com port and click connect. After the connection is successful, you can see the reported data in the NMEA window.
   Note: For the detailed meaning, please refer to the description in Section 3 NMEA0183 protocol.

3. After the positioning is successful, the latitude and longitude information can be obtained in the $GPRMC field reported by the serial port.
   For more detailed tool usage information, please refer to the tool. manual in the kit.

Command format

7.1 GKC interface data format
The Goke Command (GKC) interface is the interface for interaction between the user and GK9501. Its command format is as follows:

7.2 GKC command

next GKC instruction

Arguments

| Indicates the parameters required to send the command, the parameters can

be multiple, and different commands correspond to different data

|

The reference value refers to the next GKC instruction

*| end of data sign|  

CheckSum

|

Checksum data for the entire command

| CheckSum value is in the whole command from PGKC to

CR，LF

|

end of package sign

| *The previous argument XOR value, such as “$PGKC030,3,1”, its check value is the XOR value of “PGKC030,3,1”, its XOR value is 2E

7.2. Response message
Command: 001
reply message
Response to the message processing result sent by the other party Arguments:
Arg1: the command of the message to which this message responds Arg2:
“1”, the received message is not supported
“2”, valid message, but incorrect execution
“3”, valid message, and executed correctly
Example: Send a single GPS command: $PGKC115,1,0,0,02B Reply message: $PGKC001,115,3,1,0,0,0,0,128

7.2.2 System reboot
Command: 030
System reboot command
Arguments:
Arg1:
“1”, warm start
“2”, warm start
“3”, cold start
“4”, full cold start
Arg2:
“1”, software restart
“2”, hardware restart
“3”, clear nvram, keep flash reboot
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
Example： Full cold start command: $PGKC030,4,22AHot start command: $PGKC030,1,12C Remarks: Arg2 is set to 1 for both warm start and warm start, and Arg2 is 1, 2, and 3 for full cold start. In general, the cold start is the full cold start mode, Arg1 is set to 4, Arg2 is set to 2, and the hardware boot mode is not used.
7.2.3 Erase auxiliary information
Command: 040
Erase auxiliary information in flashArguments: None
Example: $PGKC0402B
7.2.4 Low power mode
Command: 051
Enter standby low power mode
Arguments:
Arg1: “0”, stop mode
Example:
$PGKC051,037
This command can be woken up by sending any command, invalid commands can also be used, the hardware can be woken up by plugging
and unplugging the serial port, and the original low-power command can be sent directly.
7.2.5 Message interval configuration
Command: 101
Configure the interval for outputting NMEA messages (unit: ms)
Arguments:
Arg1: 100-10000
Example:
$PGKC101,100002
The command set is to output NMEA data every 1000ms, which is 1s.
Remarks: When setting the message interval output above 2HZ, first increase the baud rate to above 115200 to ensure high-frequency NMEA message output. This command is not saved in Flash, and will be restored to the original NMEA output frequency after power failure; baud rate Modification requires firmware version 3.0 or above to support configuration, and NMEA frequency does not support saving.
7.2.6 Periodic low power mode
Command: 105
Enter periodic low power mode
Arguments:
Arg1:
“0”, normal operating mode
“1”, period ultra-low power tracking mode
“4”, directly enter ultra-low power tracking mode
“8”, low power consumption mode, you can wake up by sending commands through the serial port
Arg2:
Run time (ms), this parameter has effect in periodic mode with Arg1 = 1.
Arg3:
Sleep time (milliseconds), in periodic mode where Arg1 is 1, this parameter works.
Example:
$PGKC105,83F<LF
$PGKC105,1,5000,80003B<LF
Note: In low-power mode, the CPU will sleep and can be woken up through the serial port; in ultra-low-power tracking mode, when the CPU is powered off, it will automatically wake up periodically for positioning output.
7.2.7 Set star search mode
Command： 115
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
Set star search mode
Arguments：
Arg1：
“1”，GPS on
“0”，GPS off
Arg2：
“1”，Glonass on
“0”，Glonass off
Arg3；
“1”，Beidou on
“0”，Beidou off
Arg4：
“1”，Galileo on
“0”，Galileo off
Example：
To set the star search mode to single GPS mode, the command is as follows:
$PGKC115,1,0,0,02B
Note: Although the single Galileo mode command $PGKC115,0,0,0,12B can be sent successfully, the current GK9501 firmware does not support Galileo star search mode.
7.2.8 Save star search mode
Command： 121
Set star search mode，save it to flash
Arguments：
Arg1：
“1”，GPS on
“0”，GPS off
Arg2：
“1”，Glonass on
“0”，Glonass off
Arg3：
“1”，Beidou on
“0”，Beidou off
Arg4：
“1”，Galieo on
“0”，Galieo off
Example：
Set star search mode to single GPS mode
$PGKC121,1,0,0,02C
Remarks: The difference between Command115 and 121 commands is that the 115 command will not be saved in flash after setting, the star search mode set will disappear after restarting, the 121 command setting will be saved in flash, and the star search mode set after restarting will be retained Down, neither 115 nor 121 support Galilean galaxies.
7.2.9 Serial port parameter setting
Command： 146
Set the serial port input and output format and baud rate
Arguments：
Arg1：
”3”，NMEA format
Arg2：
“3”，NMEA format
Arg3：
9600，19200，38400，57600，115200……921600，
Example： $PGKC146，3，3，96000F
7.2.10 Set NMEA output
Command： 147
Set NMEA output baud rate；
Arguments:
Arg1:
9600，19200，38400，57600，115200……921600,
Example:
$PGKC147,11520006
7.2.11 GPD document delete
Command： 047
Delete GPD doc in flash
Arguments：None
Example：
$PGKC0472C
7.2.12 Set NMEA serial port parameter
Command： 149
Set NMEA serial port parameter
Arguments：
Arg1：
“0”，NMEA data
“1”，Binary data
Arg2:9600，19200，38400，57600，115200……921600，
Example：
$PGKC149，0，384002C
$PGKC149，1，11520015
Remarks: This command is usually used in AGPS to load GPD files into Flash; the baud rate modification requires firmware version 3.0 or above to support configuration;
7.2.13 PPS configuration
Command： 161
PPS configuration
Arguments：
Arg1：
“0”，turn off PPS output
“1”，first time fix
“2”，3D fix
“3”，2D/3D fix
“4”，always on
Arg2： PPS pulse width（ms）
Arg3： PPS pulse period（ms）
Example： $PGKC161，2，500，20000
Note: The maximum pulse width of PPS is 998ms, the minimum is 1ms, and the minimum range of pulse period is 1000ms.
7.2.14 Query message interval
Command： 201 Query interval for NMEA messagesArguments: None
Example: $PGKC2012C
7.2.15 Return message interval
Command：202
Interval for returning NMEA messages (response to 201 command)
Arguments：None
Example： $PGKC202，1000，0，0，0，0，0，002
7.2.16 Set NMEA output frequency
Command： 242
Set NMEA sentence output frequency
Arguments：
Arg1： GLL
Arg2：RMC
Arg3：VTG
Arg4：GGA
Arg5：GSA
Arg6：GSV
Arg7：GRS
Arg8：GST
Arg9~Arg21：Remain
Example：
$PGKC242,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,037
7.2.17 Query NMEA output frequency
Command：243
Query NMEA sentence output frequency
Arguments：None
Example：
$PGKC2432A
7.2.18 Return the NMEA output frequency
Command： 244
Return the NMEA sentence output frequency (in response to the 243 command)
Arguments：
Args：Refer to 242 Commands
Example:
$PGKC244,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,031
7.2.19 Set reference coordinates
Command： 269
Set reference coordinates
Arguments：
Arg1: “0”，WGS84
Example： $PGKC269,03E
7.2.20 Query Reference Coordinate System
Command： 270
Query Reference Coordinate System
Arguments：None
Example： $PGKC2702A
7.2.21 Return Reference Coordinate System
Command： 271
Return to the reference frame (response to command 270)
Arguments：
Arg1：Refer to 269 Commands
Example：
$PGKC271，037
7.2.22 Query RTC time
Command： 279
Query RTC time
Arguments：None
Example： $PGKC27923
7.2.23 Return RTC time
Command： 280
Return RTC time（response to command 279）
Arguments：
Args： Refer to 278 Commands
Example： $PGKC280,2017,3,15,12,0,015
7.2.24 Set the speed threshold
Command： 284
Set the speed threshold, when the speed is lower than the threshold, the output speed is 0
Arguments：
Arg1：
Threshold value
Example：
$PGKC284,0.526
Note: The speed unit is m/s. If the speed is set to a negative number, the command will not take effect, and the original speed threshold output will be maintained.
7.2.25 Set HDOP Threshold
Command： 356
Set the HDOP threshold, when the actual HDOP is greater than the threshold, no positioning
Arguments：
Arg1：Threshold value
Example：
$PGKC356,0.72A639
7.2.26 Get HDOP Threshold
Command： 357
Get HDOP Threshold
Arguments：None
Example：
$PGKC3572E
7.2.27 Version number query
Command: 462
Query the version number of the current software
Arguments: None
Example:
$PGKC4622F
7.2.28 Return the current version number
Command： 463
Return the version number of the current software (responds to the 462 command)
Arguments：None
Example：
$PGKC463,GK9501_2.0_Aug 10 2020,GOKE microsemi 3F
7.2.29 Set location and time information
Command： 639
Set approximate location and time information for faster positioning
Arguments：
Arg1: Latitude, eg: 28.166450
Arg2: Longitude, eg: 120.389700
Arg3: height, eg: 0
Arg4: Year
Arg5: month
Arg6: Day
Arg7: Hour, time is UTC time
Arg8: points
Arg9: seconds
Example：
$PGKC639,28.166450,120.389700,0,2017,3,15,12,0,033
Remarks: Among them, the unit of latitude and longitude is degrees, and the height is meters
7.2.30 Set positioning mode
Command： 786
Set positioning mode
Arguments：
Arg1：
“0”, normal mode
“1”, fitness mode for walking and jogging
“2”, aero mode, suitable for high-speed sports mode
“3”, balloon mode, for elevation mode
Example： $PGKC786,13B
7.2.31 Query ID information
Command： 490
Query the current FLASH unique ID information.
Arguments：None
Example：
$PGKC49022
7.2.32 Return ID information
Command： 491
Return the current FLASH unique ID information (response to 490 command)
Arguments：
Arg1：
ManufacturerID and DeviceID in Flash, For example：1351
Arg2：
UniqueID1, For example：32334C30,AE000230
Arg3：
UniqueID2, For example：FF507900,FFFFFFFF
Example： $PGKC491,1351,32334C30,AE000230,FF507900,FFFFFFFF,*5E
7.3 Support NMEA0183 protocol
GK9501 supports NMEA0183 V4.1 protocol and is compatible with previous versions. For more information about NMEA0183 V4.1, please refer to the official NMEA 0183 V4.1 document. Common output formats are as follows: GGA: time, location, number of satellites
GSA: GPS receiver operating mode, satellites used for positioning, DOP value, positioning status GSV: visible GPS satellite information, elevation, azimuth, signal-to-noise ratio RMC: time, date, position, speed VTG: ground speed information
7.3.1 Statement identifier

7.3.2 GGA
$–GGA,hhmmss.ss,llll.ll,a,yyyyy.yy,a,x,xx,x.x,x.x,M,x.x,M,x.x,xxxxhh
Sample data：$GPGGA,065545.789,2109.9551,N,12023.4047,E,1,9,0.85,18.1,M,8.0,M,,5E

Positioning instructions

|  |  | 0: not located

1: SPS mode, positioning is valid

2: Differential, SPS mode, positioning is valid 3: PPS mode, positioning is valid

number of satellites| 9|  | Range 0 to 12
HDOP| 0.85|  | Horizontal accuracy
MSL amplitude| 18.1| M|
unit| M| M|
the earth| -2.2| M|
unit| M|  | –
differential time| 8.0| S| Invalid when there is no DGPS
Differential ID| 0000|  |
checksum| *5E|  |